Sayyiduna al-Muhajir bin Qunfudh (may Allah be pleased with him) relates: The Prophet (peace and blessings be upon him) saw three people riding on one camel, and he said: "The third one is cursed."
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 438